I'm not sure if it's me you're asking where I learned about D-Mannose but a friend connected me with her New Zealand pen pal of 50 yrs who has had UTI problems and it is from her that I first heard/learned about it. She suggested I check it out which I did. I mentioned it to my GP who had heard of D-M but didn't know it was used for UTI's, she found a study on it and since has suggested it to many of her patients with UTI problems. I mentioned it to my urologist who had no reaction either way--I almost wondered if they were worried about losing so many patient visits--I know I sure had a lot of them previous to D-M.
Interesting to see you're Iowa, so am I.